Genuine OEM Volkswagen Hexagon Socket Bolt, part number N91021501. This bolt is designed to fasten components within the engine's timing, brake, and coolant systems. It is positioned at point 10 in the diagram. The bolt has dimensions of 0.025m length, 0.01m width, and 0.01m height, weighing 0.0125 kg. Genuine OEM bolts ensure precise fitment and material strength for critical engine and brake system connections.